Custom type in GraphQL mutation

Question

I am using GraphQL js .I want to implement One-to-many association in it.I have two types user and Office .One user has many offices.

userType:

var graphql = require('graphql');
const userType = new graphql.GraphQLObjectType({
name: 'user',
fields :()=>{
var officeType=require('./officeSchema');
return {
  _id: {
    type: graphql.GraphQLID
  },
  name: {
    type: graphql.GraphQLString
  },
  age: {
    type: graphql.GraphQLString
  },
  office:{
    type:officeType
  }
};
}
 });
module.exports=userType;

officeSchema:

const officeType = new graphql.GraphQLObjectType({
name: 'office',
fields:()=> {
var userType = require('./userSchema');
return {
  _id: {
    type: graphql.GraphQLID
  },
  room: {
    type: graphql.GraphQLString
  },
  location: {
    type: graphql.GraphQLString
  },
  users: {
    type: new graphql.GraphQLList(userType),
    resolve: (obj,{_id}) => {
     fetch('http://0.0.0.0:8082/office/user/'+obj._id, {
          method: "GET",
          headers: {
            'Content-Type': 'application/json'
          }
        })
        .then(function(res) {return res}); 
  }
  }
 };
 }
});

Now the mutation code is as follows:

const Adduser = {
type: userType,
args: {
    name: {
        type: graphql.GraphQLString
    },
    age: {
        type: graphql.GraphQLString
    }

},
resolve: (obj, {
    input
}) => {

}
};
const Addoffice = {
type: OfficeType,
args: {
     room: {
            type: graphql.GraphQLString
        },
        location: {
            type: graphql.GraphQLString
        },
        users: {
            type: new graphql.GraphQLList(userInputType)
        }
},
resolve: (obj, {
    input
}) => {

}
};
const Rootmutation = new graphql.GraphQLObjectType({
name: 'Rootmutation',
fields: {
    Adduser: Adduser,
    Addoffice: Addoffice
}
});

This code is throwing error as

Rootmutation.Addoffice(users:) argument type must be Input Type but got: [user].

I want to add the actual fields in database as well as associated tables' fields but couldn't figure out the problem.

Updated:

1-Added GraphQLInputObjectType:

const officeInputType = new graphql.GraphQLInputObjectType({
name: 'officeinput',
fields: () => {
    return {
        room: {
            type: graphql.GraphQLString
        },
        location: {
            type: graphql.GraphQLString
        }
    }
 }
});
const userInputType = new graphql.GraphQLInputObjectType({
name: 'userinput',
fields: () => {
    return {
        name: {
            type: graphql.GraphQLString
        },
        age: {
            type: graphql.GraphQLString
        }
    }
  }
});

2-Added userinputtype instead of usertype in AddOffice.

Now the error is

 Rootmutation.Addoffice(user:) argument type must be Input Type but got: userinput.

Answer 1

The problem is that you provided userType as one of the argument types for the Addoffice mutation. userType cannot be an argument type. Instead, you must use an input type.

There are two object types: output and input types. Your userType and officeType are output types. You need to create an input type using GraphQLInputObjectType [ docs ]. It will likely have very similar fields. You can use that as a type on your argument field.

const userInputType = new graphql.GraphQLInputObjectType({
  name: 'UserInput',
  fields () => {
    return {
      _id: {
        type: graphql.GraphQLID
      },
      // ...
    };
  }
});